This piece by 'Random International' (made up of Florian Ortkrass and Stuart Wood) features 3D depth cameras, which enable the viewer to pass freely throughout the room without getting any rain fall on them.

Random International said: Rain Room is the latest in a series of projects that specifically explore the behaviour of the viewer and viewers: pushing people outside their comfort zones, extracting their base auto-responses and playing with intuition. Observing how these unpredictable outcomes will manifest themselves, and the experimentation with this world of often barely perceptible behaviour and its simulation is our main driving force.